Exceptional character development distinguishes Thriller Award–winner Ellison’s third Samantha Owens novel (after 2012’s Edge of Black), the best yet in the series. When Sam, now head of Georgetown University Medical School’s forensic pathology department in Washington, D.C., receives a letter from a stranger named Timothy Savage asking her to solve his murder, she gets drawn back into her former career in law enforcement. Sam performs an autopsy on Savage, who recently died in Lynchburg, Va., and the examination shows he did not commit suicide, as the police ruled, but was indeed murdered. Meanwhile, Sam and her boyfriend, former Army Ranger Xander Whitfield, become embroiled in a search for a missing child whose disappearance may be related to Savage’s death. The suspense builds as Sam and Xander, aided by D.C. homicide detective Darren Fletcher, chase down a host of surprising leads. The author’s ability to neatly tie together the mysterious clues helps make this a standout in the romantic thriller subgenre. Agent: Scott Miller, Trident Media Group. (Mar.)